php project was done and functional but now is a small bug - open to bidding

<?php require('[login to view URL]'); require_once('[login to view URL]'); require_once('[login to view URL]'); $connection = getConnection(); $event_exists_result = mysqli_query($connection, "SELECT * FROM events, invitees, notifications WHERE [login to view URL] = [login to view URL] AND [login to view URL] = [login to view URL] AND [login to view URL] > now()"); //$event_exists_result = mysqli_query($connection, "SELECT * FROM events, invitees, notifications WHERE [login to view URL] = [login to view URL] AND [login to view URL] = [login to view URL] AND [login to view URL] > now() AND [login to view URL] < timestampadd(hour, 23, now())"); if (mysqli_num_rows($event_exists_result) > 0) { //mailNotification('[login to view URL]@[login to view URL]', 'Harry3', 'datetime', 'cron job run successfully.');//loeschen while($row = mysqli_fetch_assoc($event_exists_result)) { $user_query_result = mysqli_query($connection, "Select * from users where id=".$row['userId']); $user = mysqli_fetch_assoc($user_query_result); $number_of_emails_sent = $user['week_emails_sent']; $datetime = DateTime::createFromFormat('Y-m-d H:i', $row['eventDate']); $datetime->modify("+".$row['eventDuration']." minutes"); $event_end_time = $datetime->format('Y-m-d H:i'); $time_str = "From ".DateTime::createFromFormat('Y-m-d H:i', $row['eventDate'])->format('Y-m-d H:i')." to ".$event_end_time; if($row['sendEmail'] = 1 && $row['inviteeEmail'] != ""){ mailNotification($row['inviteeEmail'], $row['inviteeFirstName'],$row['inviteeLastName'], $time_str, $row['msgForInvitee']); }